'Deep' in the Bible

“They did not say, ‘Where is the LordWho brought us up out of the land of Egypt,Who led us through the wilderness,Through a land of deserts and of pits,Through a land of drought and of deep darkness,Through a land that no one crossedAnd where no man dwelt?’

Give glory to the Lord your God,Before He brings darknessAnd before your feet stumbleOn the dusky mountains,And while you are hoping for lightHe makes it into deep darkness,And turns it into gloom.